An Experimental Study on Ratcheting Behavior of Polyacetal Tube Under Uniaxial Ioading and Internal Pressure

Document Type : Research Article

Authors

Abstract

In this study, the experimental tests are designed and carried out to analyze the behavior of polyacetal ratcheting under both uniaxial loading and internal pressure. Experimental tests are performed by an accurate servo-hydraulic machine, Instron 8802. Three group tests were presented in which two of the stress amplitude, mean stress or internal pressure was constant to observe the effect of another factor. The effect of stress amplitude, mean stress and internal pressure on ratcheting strain and softening behavior of the polyacetal tube are investigated. Graphs of ratcheting strain, ratcheting strain range, hysteresis loops of group tests were drawn. By using these graphs, some results such as softening behavior obtained. A suitable hardening factor was presented and its relation with the polyacetal fatigue life was examined. In a specific loading cycle for the specimen, whose hardening factor is more than the others, a lower fatigue life predicted. Softening behavior of the material, increases with increasing the loading cycles. The results show that the specimen with the high ratcheting strain value has lower fatigue life.

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References

[1] Tao, Gang; Xia, Zihui, “Ratcheting behavior of an epoxy polymer and its effect on fatigue life”, Polymer Testing, Vol. 26, pp. 451- 460, 2007.
[2] Rahman , Syed M.; Hassan, Tasnim, “Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic ending and steady internal pressure”, Edmundo Corona, International Journal of Plasticity, Vol. 24, pp. 1756- 1791, 2008.
[3] Xia, Z.; Kujawski, D.; Ellyin, F., “Effect of mean stress and ratcheting strain on fatigue life of steel”, Int J. Fatigue Vol. 18 No. 5, pp. 335-341, 1996.
[4] Hartmann, Stefan, “Modeling and Simulation of Polyoxymethylene”, PAMM Proc. Appl. Math. Mech., Vol. 5, pp. 273– 274, 2005.
[5] Chen, Xu; Hui, Shucai, “Ratcheting behavior of PTFE under cyclic compression”, Polymer Testing, Vol. 24, pp. 829- 833, 2005.
[6] Zhang, Zhe; Chen, Xu; “Multiaxial ratcheting behavior of PTFE at room temperature”, Polymer Testing, Vol. 28, pp. 288- 295, 2009.
[7] Liu, Wei; Gao, Zongzhan; Yue, Zhufeng, “Steady ratcheting strains accumulation in varying temperature fatigue tests of PMMA”, Materials Science and Engineering A, Vol. 492, pp. 102- 109, 2008.
[8] Mohanraj, J.; Barton, D.C.; Ward, I.M.; Dahoun, A.; Hiver, J.M.; G’Sell, C,“Plastic deformation and damage of polyoxymethylene in the large strainrange at elevated temperatures”, Polymer, Vol. 47, pp. 5852–5861, 2006.
[9]  شریعتی، متمود، ایپک چی، حمیدرضا؛ حاحمی، حسین ،” اررسی حجرای و عددی رفتار رچتینگ پوسته استوانهای حت اارذااری متوری حناوای “، نوزدهمین همایش سالانه مهندسی مکانیک ایران، دانشگاه ایرجند، اردیبهش ، ج.دوم، صفته 69 ، سال 1390
[10] Shariati , M.; Hatami ,H.; Yarahmadi ,H.; Eipakchi ,H, “An experimental study on the ratcheting and fatigue behavior of polyacetal under uniaxial cyclic loading”, Materials & Design, Vol. 34, pp. 302- 312, 2012.
[11] Shariati, M.; Hatami, H.; Eipakch, H.; Yarahmadi, Torabi, H., “Experimental and numerical investigation on softening behavior of POM under cyclic strain-controlled loading”, Polymer- Plastic technology and engineering, Vol. 50, pp. 1- 7, 2011.
[12] Shariati, M.; Hatami, H., “Experimental study of SS304L cylindrical shell with/without cutout under cyclic axial loading”, Theoretical and Applied Fracture Mechanics, Vol. 58, pp. 35-43, 2012.
[13] Tsyban’ov , G.V.; Novikov , A.I., “Ultimate hardening/softening model of material for fatigue crack initiation onset and determination of its parameters”, International Journal of Fatigue, Vol. 39, pp. 15- 24, 2012.
[14] Chiou , Yung-Chuan; Jen, Yi-Ming; Weng, Wen-Kai, “Experimental investigation on the effect of tensile pre-strain on ratcheting behavior of 430 Stainless Steel under fully-
reversed loading condition”, Engineering Failure Analysis, Vol. 18, pp. 766- 775, 2011.
[15] Drozdov, A.D., “Stress- and strain-controlled cyclic deformation of polypropylene”, Computational Materials Science, Vol. 58, pp. 35- 43, 2012.
[16] Tao, G.; Xia, Z., “Ratcheting behavior of an epoxy polymer and its effect on fatigue life”, Polymer Testing, Vol. 26, pp. 451- 460, 2007.
17] Paul, S.K.; Sivaprasad, S.; Dhar, S.; Tarafder, S., “Cyclic plastic deformation and cyclic hardening/softening behavior in 304LN stainless steel”, Theoretical and Applied Fracture Mechanics, Vol. 54, pp. 63- 70, 2010.
Amirkabir Journal of Mechanical Engineering
Volume 46, Issue 2 - Serial Number 2
February 2015
Pages 13-21

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